Concept 1: What is Flash?
Flash is ElevenLabs' newest text-to-speech AI model designed specifically for:
- π£οΈ Conversational voice agents
- β‘ Low-latency applications (real-time interactions)
Think of it as a tool that converts text into spoken audio very quickly
Concept 2: What Makes Flash Special β Latency
Latency = the delay between requesting speech and receiving it
| What Flash Offers |
|---|
| 75ms base generation speed |
| + application & network latency on top |
Why it matters: In real conversations, long delays feel unnatural. 75ms is fast enough to feel human-like
Concept 3: The Two Flash Versions
| Feature | Flash v2 | Flash v2.5 |
|---|---|---|
| Languages | English only | 32 languages |
| Cost | 1 credit / 2 characters | 1 credit / 2 characters |
| Model ID | eleven_flash_v2 | eleven_flash_v2_5 |
Concept 4: The Quality vs. Latency Tradeoff
This is the core concept to understand:
Higher Quality ββββββββββ Lower Latency
(Turbo Models) (Flash)
- Flash is slightly lower in quality and emotional depth than Turbo models
- BUT it is significantly faster
- In blind tests, Flash outscored other ultra-low-latency competitors
Key takeaway: You trade a little quality for much faster response times
Concept 5: How to Access Flash
Two ways to use it:
- No-code: ElevenLabs Conversational AI platform
- Developer API:
https://elevenlabs.io/docs/api-reference/text-to-speech/convert
Simply reference the model ID in your API call
Summary
| Concept | Key Point |
|---|---|
| What it is | Fast text-to-speech model |
| Speed | 75ms generation latency |
| Versions | v2 (English) / v2.5 (32 languages) |
| Tradeoff | Speed over quality |
| Best for | Real-time conversational AI agents |